A. Metals. B. Non-metals. C. Polymers. D. Com0posites.
A. Classification based on composition. B. Classification base on structure. C. Functional classification of materials. D. A, B and C.
A. Crystalline materials. B. Non-crystalline materials. C. A and B.
A. Compostion. B. Structure. Composition and structure.
A. 电子构型 B. 晶体结构 C. 显微结构 D. A，B and C.
A. 对 B. 错
A. index.html B. index.htm C. index.php D. index.php3
A. gb2312 B. gbk C. latin1 D. utf8
A. 80 B. 8080 C. 81 D. 82
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